Congenital syphilis is a congenitally acquired infection with the bacterium Treponema pallidum. Although it is a relatively uncommon presentation, congenital syphilis can be a devastating diagnosis, and earlier diagnosis carries the potential for significant improvement to an affected individual's quality of life. 

Transmission of T pallidum can occur in utero via the placenta after 4 months gestation, or through exposure to infectious vaginal lesions during delivery (perinatal syphilis). The subsequent signs and symptoms of congenital syphilis can be divided into two categories: (1) early congenital syphilis describes manifestations presenting before 2 years of age; (2) late congenital syphilis describes manifestations presenting after 2 years of age.

The symptoms of late congenital syphilis are analogous to tertiary syphilis in the adult. The signs and symptoms for both arise from either continued inflammatory processes against T pallidum antigens or attempts by the body to control the damage from infection in utero. Although late congenital syphilis is subclinical in 60% of cases, manifestations can occur into the early 20s and most commonly involve the bones, teeth, and nervous system. Hutchinson's triad, which is pathognomonic for late congenital syphilis, is defined by the presence of interstitial keratitis, Hutchinson incisors, and eighth nerve deafness.